New Fiats sell reasonably well in NZ. Nothing like Toyota or Holden etc but not bad. We dont get all the models though. The vast majority of cars on the road in NZ are however, 2nd hand imports from Japan. There are virtually no imported Fiats so overall there are very few Fiats compared with Japanese brands. New Zealand buys more 2nd hand cars from Japan than any other country by a long way. Concidering our population, that should illustrate what sort of cars we have on our roads. NZ also gets some JDM specific models new. No other countries get these AFAIK.
As far as Unos go, we got stacks of Mk1's but very few Mk2s. Mk2 turbos would be one of the rarest "modern" Fiat. There were less than 20 sold here. Mk2's would probably out number Mk1's now as the mk1s have all rusted away.
There are not too many American cars. We only really get Some Chryslers and Jeeps.